MESON Chess Problem Database

Problem Display
PID: 55719 (Qb6/p7/r1p4K/4P3/2N5/1R2pk1p/2p1pNRB/2q1r1nB w - - 0 1)

Mansfield, Comins

5th HM., Szachy, 1977

Qb6/p7/r1p4K/4P3/2N5/1R2pk1p/2p1pNRB/2q1r1nB

#2

9 + 12

4054 Complete Mansfield/III 1999

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Sd2#
      • 2.Rxe3#
    • 1...Qd2
      • 2.Sxd2#
    • 1...Qa3
      • 2.Sd2#
    • 1...Qa1
      • 2.Sd2#
      • 2.Rxe3#
    • 1...Qb1
      • 2.Sd2#
      • 2.Rxe3#
    • 1...Qd1
      • 2.Rxe3#
    • 1...Ra1
      • 2.Qxc6#
    • 1...Ra2
      • 2.Qxc6#
    • 1...Ra3
      • 2.Qxc6#
    • 1...Ra4
      • 2.Qxc6#
    • 1...Bxe5
      • 2.Sxe5#
    • 1...Bc7
      • 2.Qf8#
  • Tries
    • 1.Rg3+?
      • 1...Kf4
        • 2.Rf3#
        • 2.Rg5#
      • 1...Kxf2!
    • 1.Rxb8?
      • threat
        • 2.Rf8#
      • 1...exf2+
        • 2.Rg5#
      • 1...Qa3!
    • 1.Qb7?
      • threat
        • 2.Qf7#
      • 1...Bxe5
        • 2.Sxe5#
      • 1...Bc7!
    • 1.Qxb8?
      • threat
        • 2.Qf8#
      • 1...Qa3
        • 2.Sd2#
      • 1...c5+!
  • Keys
    • 1.Rb7!
      • threat
        • 2.Rf7#
      • 1...exf2+
        • 2.Rg5#
      • 1...c5+
        • 2.Rb6#
      • 1...Bxe5
        • 2.Sxe5#
      • 1...Bc7
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • Q(a);N_GUARD::S(F),XQ(a)
    • Q(a);N_GUARD::S(F)
    • Q(a);N_GUARD::R1(E),XP(f)
    • R(i);N_GUARD::QAB(I),XP(j)
    • B(l);XP(G)::S(F),XB(l)
    • B(l);OGATE::QAR(I)
  • Tries
    • Try
      • R(C);CHECK
      • Refutation
        • K(g);N_SPINP(f),P-FLIGHT,XS(B)
    • Try
      • R(E);N_PINP(f),P_PINP(j),XB(l)
      • Threat
        • R(E)
      • Vars
        • P(f);CHECK,SBLOCK,XS(B)::B(A)+R(C)
      • Refutation
        • Q(a);
    • Try
      • Q(I);
      • Threat
        • QAR(I)
      • Vars
        • B(l);XP(G)::S(F),XB(l)
      • Refutation
        • B(l);
    • Try
      • Q(I);XB(l)
      • Threat
        • QAR(I)
      • Vars
        • Q(a);N_GUARD::S(F)
      • Refutation
        • P(j);CHECK
  • Actual
    • R(E);N_PINP(f)
    • Threat
      • R(E)
    • Vars
      • P(f);CHECK,SBLOCK,XS(B)::B(A)+R(C)
      • P(j);CHECK,OGATEB::QAB(I)+R(E)
      • B(l);XP(G)::S(F),XB(l)
      • B(l);OGATE::QAR(I)
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