MESON Chess Problem Database

Problem Display
PID: 271956 (K4n2/B4Q1p/2p2P1P/P7/8/r2kNP2/Nn1p4/3B4 w - - 0 1)

Thomson, Robert Gavin

Comm., Sunday Referee, 1934

(First published on Sun Feb 25 1934)

K4n2/B4Q1p/2p2P1P/P7/8/r2kNP2/Nn1p4/3B4

#2

10 + 7

15239 Valois Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa2
      • 2.Qb3#
    • 1...Rb3
      • 2.Qxb3#
    • 1...Rc3
      • 2.Sb4#
    • 1...Ra4
      • 2.Qb3#
    • 1...Rxa5
      • 2.Qb3#
    • 1...Sxd1
      • 2.Qc4#
    • 1...Sa4
      • 2.Qc4#
    • 1...Sc4
      • 2.Qxc4#
    • 1...Se6
      • 2.Qxh7#
    • 1...Sg6
      • 2.Qd7#
    • 1...Sd7
      • 2.Qxd7#
      • 2.Qxh7#
  • Tries
    • 1.Kb7?
      • 1...Rb3+
        • 2.Qxb3#
      • 1...Rxa2
        • 2.Qb3#
      • 1...Rxa5
        • 2.Qb3#
      • 1...Sxd1
        • 2.Qc4#
      • 1...Rc3
        • 2.Sb4#
      • 1...Ra4
        • 2.Qb3#
      • 1...Sa4
        • 2.Qc4#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Se6
        • 2.Qxh7#
      • 1...Sg6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#
        • 2.Qxh7#
      • 1...c5!
    • 1.Kb8?
      • 1...Rb3+
        • 2.Qxb3#
      • 1...Sd7+
        • 2.Qxd7#
      • 1...Rxa2
        • 2.Qb3#
      • 1...Rxa5
        • 2.Qb3#
      • 1...Sxd1
        • 2.Qc4#
      • 1...Rc3
        • 2.Sb4#
      • 1...Ra4
        • 2.Qb3#
      • 1...Sa4
        • 2.Qc4#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Se6
        • 2.Qxh7#
      • 1...Sg6
        • 2.Qd7#
      • 1...c5!
    • 1.Sg4?
      • threat
        • 2.Sf2#
        • 2.Se5#
      • 1...Rxa2
        • 2.Qb3#
      • 1...Rxa5
        • 2.Sf2#
        • 2.Qb3#
      • 1...Se6
        • 2.Se5#
      • 1...c5
        • 2.Qd5#
      • 1...Sc4
        • 2.Sf2#
      • 1...Sg6
        • 2.Sf2#
      • 1...Sd7
        • 2.Sf2#
      • 1...Sxd1!
    • 1.Bc5?
      • 1...Rxa2
        • 2.Qb3#
      • 1...Sxd1
        • 2.Qc4#
      • 1...Rb3
        • 2.Qxb3#
      • 1...Rc3
        • 2.Sb4#
      • 1...Ra4
        • 2.Qb3#
      • 1...Sa4
        • 2.Qc4#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Se6
        • 2.Qxh7#
      • 1...Sg6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#
        • 2.Qxh7#
      • 1...Rxa5+!
    • 1.Qe6?
      • threat
        • 2.Qf5#
        • 2.Qe4#
        • 2.Qd6#
      • 1...Rxa2
        • 2.Qb3#
      • 1...Rxa5
        • 2.Qb3#
        • 2.Qe4#
      • 1...Sxd1
        • 2.Qc4#
      • 1...c5
        • 2.Qe4#
      • 1...Ra4
        • 2.Qb3#
      • 1...Sc4
        • 2.Qxc4#
        • 2.Qf5#
        • 2.Qe4#
      • 1...Sxe6!
    • 1.Qg8?
      • 1...Rxa2
        • 2.Qb3#
      • 1...Rxa5
        • 2.Qb3#
      • 1...Sxd1
        • 2.Qc4#
      • 1...Rb3
        • 2.Qxb3#
      • 1...Rc3
        • 2.Sb4#
      • 1...Ra4
        • 2.Qb3#
      • 1...Sa4
        • 2.Qc4#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Se6
        • 2.Qxh7#
      • 1...Sg6
        • 2.Qd8#
      • 1...Sd7
        • 2.Qxh7#
      • 1...c5!
    • 1.Qxh7+?
      • 1...Sg6
        • 2.Qxg6#
        • 2.Qd7#
      • 1...Sxh7!
    • 1.a6?
      • 1...Rxa2
        • 2.Qb3#
      • 1...Rxa6
        • 2.Qb3#
      • 1...Sxd1
        • 2.Qc4#
      • 1...Rb3
        • 2.Qxb3#
      • 1...Rc3
        • 2.Sb4#
      • 1...Ra4
        • 2.Qb3#
      • 1...Ra5
        • 2.Qb3#
      • 1...Sa4
        • 2.Qc4#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Se6
        • 2.Qxh7#
      • 1...Sg6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#
        • 2.Qxh7#
      • 1...c5!
  • Keys
    • 1.Qb7!
      • 1...Rxa2
        • 2.Qb3#
      • 1...Rxa5
        • 2.Qb3#
      • 1...Sxd1
        • 2.Qa6#
      • 1...c5
        • 2.Qe4#
      • 1...Rb3
        • 2.Qxb3#
      • 1...Rc3
        • 2.Sb4#
      • 1...Ra4
        • 2.Qb3#
      • 1...Sa4
        • 2.Qa6#
        • 2.Qb1#
      • 1...Sc4
        • 2.Qb1#
      • 1...Se6
        • 2.Qxh7#
      • 1...Sg6
        • 2.Qd7#
      • 1...Sd7
        • 2.Qxd7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(c);N_GUARD,XS(B)::QAR2(I)
    • R(c);N_GUARD::QAR2(I),XR(c)
    • R(c);SBLOCK::S(B)
    • R(c);N_GUARD::QAR2(I)
    • R(c);N_GUARD,P_PINB(H),XP(E)::QAR2(I)
    • S(a);N_GUARD,XB(A)::QAB1(I)
    • S(a);N_GUARD::QAB1(I)
    • S(a);N_GUARD::QAB1(I),XS(a)
    • S(g);N_GUARD::QAB(I),XP(f)
    • S(g);N_GUARD::QAR(I)
  • Tries
    • Try
      • K(J);S_FLIGHT
      • Vars
        • R(c);CHECK,N_GUARD::QAR2(I),XR(c)
        • R(c);N_GUARD,XS(B)::QAR2(I)
        • R(c);N_GUARD,XP(E)::QAR2(I)
        • S(a);N_GUARD,XB(A)::QAB1(I)
        • R(c);SBLOCK::S(B)
        • R(c);N_GUARD::QAR2(I)
        • S(a);N_GUARD::QAB1(I)
        • S(a);N_GUARD::QAB1(I),XS(a)
        • S(g);N_GUARD::QAB(I),XP(f)
        • S(g);N_GUARD::QAR(I)
      • Refutation
        • P(e);
    • Try
      • K(J);P-FLIGHT
      • Vars
        • R(c);CHECK,N_GUARD::QAR2(I),XR(c)
        • S(g);CHECK,N_GUARD::QAR(I),XS(g)
        • R(c);N_GUARD,XS(B)::QAR2(I)
        • R(c);N_GUARD,XP(E)::QAR2(I)
        • S(a);N_GUARD,XB(A)::QAB1(I)
        • R(c);SBLOCK::S(B)
        • R(c);N_GUARD::QAR2(I)
        • S(a);N_GUARD::QAB1(I)
        • S(a);N_GUARD::QAB1(I),XS(a)
        • S(g);N_GUARD::QAB(I),XP(f)
        • S(g);N_GUARD::QAR(I)
      • Refutation
        • P(e);
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);N_GUARD,XS(B)::QAR2(I)
        • S(g);::S(C)
        • P(e);N_GUARD::QAR2(I)
        • S(a);::S(C)
      • Refutation
        • S(a);XB(A)
    • Try
      • B(H);P_SPINP(E)
      • Vars
        • R(c);N_GUARD,XS(B)::QAR2(I)
        • S(a);N_GUARD,XB(A)::QAB1(I)
        • R(c);N_GUARD,N_PINP(E)::QAR2(I),XR(c)
        • R(c);N_PINP(E),SBLOCK::S(B)
        • R(c);N_GUARD::QAR2(I)
        • S(a);N_GUARD,N_PINP(E)::QAB1(I)
        • S(a);N_GUARD::QAB1(I),XS(a)
        • S(g);N_GUARD::QAB(I),XP(f)
        • S(g);N_GUARD::QAR(I)
      • Refutation
        • R(c);CHECK,XP(E)
    • Try
      • Q(I);
      • Threat
        • DUALS(3)
      • Vars
        • R(c);N_GUARD,XS(B)::QAR2(I)
        • S(a);N_GUARD,XB(A)::QAB1(I)
        • P(e);::QAB1(I)
        • R(c);N_GUARD::QAR2(I)
      • Refutation
        • S(g);XQ(I)
    • Try
      • Q(I);
      • Vars
        • R(c);N_GUARD,XS(B)::QAR2(I)
        • R(c);N_GUARD,P_PINB(H),XP(E)::QAR2(I)
        • S(a);N_GUARD,XB(A)::QAB1(I)
        • R(c);N_GUARD::QAR2(I),XR(c)
        • R(c);SBLOCK::S(B)
        • R(c);N_GUARD::QAR2(I)
        • S(a);N_GUARD::QAB1(I)
        • S(a);N_GUARD::QAB1(I),XS(a)
        • S(g);N_GUARD::QAB(I),XP(f)
        • S(g);OGATE::QAR(I)
      • Refutation
        • P(e);
    • Try
      • Q(I);CHECK,XP(f)
      • Refutation
        • S(g);XQ(I)
    • Try
      • P(E);
      • Vars
        • R(c);N_GUARD,XS(B)::QAR2(I)
        • R(c);N_GUARD,P_PINB(H),XP(E)::QAR2(I)
        • S(a);N_GUARD,XB(A)::QAB1(I)
        • R(c);N_GUARD::QAR2(I),XR(c)
        • R(c);SBLOCK::S(B)
        • R(c);N_GUARD::QAR2(I)
        • S(a);N_GUARD::QAB1(I)
        • S(a);N_GUARD::QAB1(I),XS(a)
        • S(g);N_GUARD::QAB(I),XP(f)
        • S(g);N_GUARD::QAR(I)
      • Refutation
        • P(e);
  • Actual
    • Q(I);
    • Vars
      • R(c);N_GUARD,XS(B)::QAR2(I)
      • R(c);N_GUARD,P_PINB(H),XP(E)::QAR2(I)
      • S(a);N_GUARD,XB(A)::QAB(I)
      • P(e);OGATE::QAB1(I)
      • R(c);N_GUARD::QAR2(I),XR(c)
      • R(c);SBLOCK::S(B)
      • R(c);N_GUARD::QAR2(I)
      • S(a);OGATE::QAB(I)
      • S(g);N_GUARD::QAB(I),XP(f)
      • S(g);N_GUARD::QAR(I)
      • S(g);N_GUARD::QAR(I),XS(g)
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