MESON Chess Problem Database

Problem Display
PID: 536 (1N1B4/1p1P4/2p4K/1Nkr3Q/P2p4/P2P4/B1p2p2/7R w - - 0 1)

Ling, John Francis

The Observer, 1960

1N1B4/1p1P4/2p4K/1Nkr3Q/P2p4/P2P4/B1p2p2/7R

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Re5
      • 2.Qxe5#
    • 1...Rf5
      • 2.Qxf5#
    • 1...Rg5
      • 2.Qxg5#
    • 1...Rxh5+
      • 2.Rxh5#
    • 1...c1Q+
      • 2.Rxc1#
    • 1...c1S
      • 2.Rxc1#
    • 1...c1B+
      • 2.Rxc1#
    • 1...c1R
      • 2.Rxc1#
    • 1...cxb5
      • 2.Qxd5#
    • 1...b6
      • 2.Sa6#
      • 2.Be7#
  • Tries
    • 1.Rc1?
      • threat
        • 2.Rxc2#
      • 1...cxb5
        • 2.Qxd5#
      • 1...Rxh5+!
    • 1.Rf1?
      • 1...c1Q+
        • 2.Rxc1#
      • 1...c1B+
        • 2.Rxc1#
      • 1...cxb5
        • 2.Qxd5#
      • 1...c1S
        • 2.Rxc1#
      • 1...c1R
        • 2.Rxc1#
      • 1...Re5
        • 2.Qxe5#
      • 1...Rf5
        • 2.Qxf5#
      • 1...Rg5
        • 2.Qxg5#
      • 1...b6
        • 2.Sa6#
        • 2.Be7#
      • 1...Rxh5+!
  • Keys
    • 1.Qh2!
      • 1...Rh5+
        • 2.Qxh5#
      • 1...Rd6+
        • 2.Qxd6#
      • 1...c1Q+
        • 2.Rxc1#
      • 1...c1B+
        • 2.Rxc1#
      • 1...Rxd7
        • 2.Sxd7#
      • 1...cxb5
        • 2.Qc7#
      • 1...c1S
        • 2.Rxc1#
      • 1...c1R
        • 2.Rxc1#
      • 1...f1Q
        • 2.Qxc2#
      • 1...f1S
        • 2.Qxc2#
      • 1...f1B
        • 2.Qxc2#
      • 1...f1R
        • 2.Qxc2#
      • 1...Re5
        • 2.Qxe5#
      • 1...Rf5
        • 2.Qd6#
      • 1...Rg5
        • 2.Qd6#
      • 1...b6
        • 2.Sa6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • R(e);OGATEB::QAR2(G),XR(e)
    • R(e);OGATEB::QAR(G),XR(e)
    • R(e);CHECK,N_SPINR(e),OGATE,XQ(G)::R(A),XR(e)
    • P(a);CHECK,OGATEB::R(A),XQ(a)
    • P(a);OGATEB::R(A),XS(a)
    • P(a);CHECK,OGATEB::R(A),XB(a)
    • P(a);OGATEB::R(A),XR(a)
    • P(f);N_GUARD,XS(F)::QAR1(G),XR(e)
  • Tries
    • Try
      • R(A);P_PINP(a)
      • Threat
        • R(A),XP(a)
      • Vars
        • P(f);N_GUARD,XS(F)::QAR1(G),XR(e)
      • Refutation
        • R(e);CHECK,N_SPINR(e),XQ(G)
    • Try
      • R(A);
      • Vars
        • P(a);CHECK,OGATEB::R(A),XQ(a)
        • P(a);CHECK,OGATEB::R(A),XB(a)
        • P(f);N_GUARD,XS(F)::QAR1(G),XR(e)
        • P(a);OGATEB::R(A),XS(a)
        • P(a);OGATEB::R(A),XR(a)
        • R(e);OGATEB::QAR2(G),XR(e)
        • R(e);OGATEB::QAR(G),XR(e)
      • Refutation
        • R(e);CHECK,N_SPINR(e),XQ(G)
  • Actual
    • Q(G);N_PINR(e)
    • Vars
      • R(e);CHECK,OGATEB::QAR(G),XR(e)
      • R(e);CHECK,N_GUARD::QAB1(G),XR(e)
      • P(a);CHECK,OGATEB::R(A),XQ(a)
      • P(a);CHECK,OGATEB::R(A),XB(a)
      • R(e);XP(I)::S(J),XR(e)
      • P(f);OGATEB,XS(F)::QAR2(G)
      • P(a);OGATEB::R(A),XS(a)
      • P(a);OGATEB::R(A),XR(a)
      • P(b);OGATE::QAR(G),XP(a)
      • R(e);OGATEB::QAR2(G),XR(e)
      • R(e);N_GUARD::QAB1(G)
      • P(g);N_GUARD::S(J)
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