MESON Chess Problem Database

Problem Display
PID: 199865 (3R4/B4b2/5r1p/1N2p3/1Np1k1B1/2p1P1nK/4r1P1/3Qb3 w - - 0 1)

Gunn, Robert Ivan

The Observer, 1946

(First published on Sun Oct 13 1946)

3R4/B4b2/5r1p/1N2p3/1Np1k1B1/2p1P1nK/4r1P1/3Qb3

#2

9 + 10

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rc2
      • 2.Qxc2#
    • 1...Rd2
      • 2.Sxc3#
    • 1...Rf1
      • 2.Sd6#
    • 1...Rf2
      • 2.Sd6#
    • 1...Rf3
      • 2.Sd6#
      • 2.gxf3#
    • 1...Rf4
      • 2.Sd6#
    • 1...Rf5
      • 2.Sd6#
    • 1...Rd6
      • 2.Sxd6#
    • 1...Re6
      • 2.Qd5#
    • 1...Bd2
      • 2.Qc2#
    • 1...Bf2
      • 2.Sxc3#
    • 1...Bd5
      • 2.Qxd5#
    • 1...Bh5
      • 2.Qd5#
    • 1...Be6
      • 2.Sd6#
    • 1...Bg6
      • 2.Qd5#
    • 1...Be8
      • 2.Qd5#
    • 1...Sf5
      • 2.Bf3#
  • Tries
    • 1.Bf3+?
      • 1...Rxf3
        • 2.Sd6#
      • 1...Kf5!
    • 1.Rd4+?
      • 1...exd4
        • 2.Qxd4#
      • 1...Kxe3!
    • 1.Qb1+?
      • 1...Rc2
        • 2.Qxc2#
      • 1...c2!
    • 1.Qd2?
      • threat
        • 2.Sxc3#
      • 1...Rxe3
        • 2.Qxe3#
      • 1...cxd2
        • 2.Sc3#
      • 1...c2
        • 2.Sc3#
      • 1...Bxd2!
  • Keys
    • 1.Re8!
      • threat
        • 2.Qd4#
      • 1...Bxe8
        • 2.Qd5#
      • 1...Rd2
        • 2.Sxc3#
      • 1...Rd6
        • 2.Sxd6#
      • 1...Re6
        • 2.Qd5#
      • 1...Bd2
        • 2.Qc2#
      • 1...Be6
        • 2.Sd6#
      • 1...Sf5
        • 2.Bf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 9
  • Sets
    • R(b);N_GUARD::QAB(A),XR(b)
    • R(b);S_CUTB(a)::S(G),XP(c)
    • R(h);N_GUARD::S(G)
    • R(h);N_GUARD::S(G),XR(h)
    • R(h);S_CUTB(j)::QAB1(A)
    • B(a);S_CUTR(b)::QAB(A)
    • B(a);N_GUARD::S(G),XP(c)
    • B(j);N_GUARD::QAB1(A),XB(j)
    • B(j);N_GUARD::QAB1(A)
    • B(j);P_PINB(F),S_CUTR(h)::S(G)
    • S(d);SBLOCK,S_CUTR(h)::B(F)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • R(h);XB(F)::S(G)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • R(I);CHECK
      • Vars
        • P(g);OGATE,XR(I)::QAR1(A),XP(g)
      • Refutation
        • K(f);P-FLIGHT,XP(C)
    • Try
      • Q(A);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB(A),XR(b)
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • Q(A);
      • Threat
        • S(G),XP(c)
      • Vars
        • R(b);OGATE,XP(C)::QAR1(A),XR(b)
        • P(c);XQ(A)::S(G)
        • P(c);::S(G)
      • Refutation
        • B(a);XQ(A)
  • Actual
    • R(I);P_PINP(g)
    • Threat
      • QAR1(A)
    • Vars
      • B(j);N_GUARD,N_SPINP(g),XR(I)::QAB1(A)
      • R(b);S_CUTB(a)::S(G),XP(c)
      • R(h);N_GUARD::S(G),XR(h)
      • R(h);N_SPINP(g),S_CUTB(j)::QAB1(A)
      • B(a);S_CUTR(b)::QAB(A)
      • B(j);N_SPINP(g),P_PINB(F),S_CUTR(h)::S(G)
      • S(d);SBLOCK,S_CUTR(h)::B(F)
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