MESON Chess Problem Database

Problem Display
PID: 188434 (2N1n2K/2p2b1P/2P1k1p1/1P2p1P1/1N1pr1P1/3p1Q2/8/8 w - - 0 1)

Rains, Cyril George

The Observer, 1937

(First published on Sun Jul 4 1937)

2N1n2K/2p2b1P/2P1k1p1/1P2p1P1/1N1pr1P1/3p1Q2/8/8

#2

9 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Re1
      • 2.Qd5#
    • 1...Re2
      • 2.Qd5#
    • 1...Re3
      • 2.Qd5#
    • 1...Rf4
      • 2.Qd5#
    • 1...Rxg4
      • 2.Qxg4#
    • 1...Bg8
      • 2.hxg8Q#
      • 2.hxg8B#
    • 1...Sd6
      • 2.Qf6#
    • 1...Sf6
      • 2.Qxf6#
    • 1...Sg7
      • 2.Qf6#
    • 1...d2
      • 2.Qb3#
  • Tries
    • 1.b6?
      • 1...Rxg4
        • 2.Qxg4#
      • 1...Sd6
        • 2.Qf6#
      • 1...Re1
        • 2.Qd5#
      • 1...Re2
        • 2.Qd5#
      • 1...Re3
        • 2.Qd5#
      • 1...Rf4
        • 2.Qd5#
      • 1...Bg8
        • 2.hxg8Q#
        • 2.hxg8B#
      • 1...Sf6
        • 2.Qxf6#
      • 1...Sg7
        • 2.Qf6#
      • 1...d2
        • 2.Qb3#
      • 1...cxb6!
  • Keys
    • 1.Sa6!
      • 1...Kd5
        • 2.Qxf7#
      • 1...Rxg4
        • 2.Sc5#
      • 1...Re1
        • 2.Sc5#
      • 1...Re2
        • 2.Sc5#
      • 1...Re3
        • 2.Sc5#
      • 1...Rf4
        • 2.Sc5#
      • 1...Bg8
        • 2.hxg8Q#
        • 2.hxg8B#
      • 1...Sd6
        • 2.Sxc7#
      • 1...Sf6
        • 2.Sxc7#
      • 1...Sg7
        • 2.Sxc7#
      • 1...d2
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 8
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(c);OGATE::QAB1(A)
    • R(c);OGATE,XP(C)::QAB(A),XR(c)
    • B(h);OGATE::PXB(h)=Q
    • S(i);N_GUARD::QAR1(A)
    • S(i);N_GUARD::QAR1(A),XS(i)
    • P(a);OGATE::QAB(A)
  • Tries
    • Try
      • P(D);
      • Vars
        • R(c);OGATE,XP(C)::QAB(A),XR(c)
        • S(i);N_GUARD::QAR1(A)
        • R(c);OGATE::QAB1(A)
        • B(h);OGATE::PXB(h)=Q
        • S(i);N_GUARD::QAR1(A),XS(i)
        • P(a);OGATE::QAB(A)
      • Refutation
        • P(g);XP(D)
  • Actual
    • S(B);
    • Vars
      • K(e);P_SPINR(c),S_FLIGHT::QAB(A),XB(h)
      • R(c);XP(C)::S(B)
      • R(c);::S(B)
      • B(h);OGATE::PXB(h)=Q
      • S(i);N_GUARD::S(B),XP(g)
      • P(a);OGATE::QAB(A)
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