MESON Chess Problem Database

Problem Display
PID: 183448 (r4N2/2Pr1PP1/3k4/2R2P2/7B/1NK2p2/3p1ppP/6QB w - - 0 1)

Serafimovic, Ilya

1st HM., YCCC, 2016

r4N2/2Pr1PP1/3k4/2R2P2/7B/1NK2p2/3p1ppP/6QB

#2

12 + 7

56 The Problemist 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.c8S#
    • 1...Ra2
      • 2.c8S#
    • 1...Ra3
      • 2.c8S#
    • 1...Ra4
      • 2.c8S#
    • 1...Ra5
      • 2.c8S#
    • 1...Ra6
      • 2.c8S#
    • 1...Ra7
      • 2.c8S#
    • 1...Re8
      • 2.fxe8S#
    • 1...d1Q
      • 2.Qxd1#
    • 1...d1S+
      • 2.Qxd1#
    • 1...d1B
      • 2.Qxd1#
    • 1...d1R
      • 2.Qxd1#
    • 1...f1Q
      • 2.Qd4#
    • 1...f1S
      • 2.Qd4#
    • 1...f1B
      • 2.Qd4#
    • 1...f1R
      • 2.Qd4#
    • 1...gxh1Q
      • 2.Qg3#
      • 2.Qg6#
    • 1...gxh1S
      • 2.Qg6#
    • 1...gxh1B
      • 2.Qg3#
      • 2.Qg6#
    • 1...gxh1R
      • 2.Qg3#
      • 2.Qg6#
  • Tries
    • 1.c8Q?
      • threat
        • 2.Qxd7#
        • 2.Qc6#
      • 1...d1S+
        • 2.Qxd1#
      • 1...Rxf7
        • 2.Qe6#
        • 2.Qc6#
      • 1...Rda7
        • 2.Qe6#
        • 2.Qc6#
      • 1...Rb7
        • 2.Qe6#
        • 2.Qc6#
      • 1...Rc7
        • 2.Qe6#
        • 2.Qxc7#
      • 1...Re7
        • 2.Qc6#
      • 1...Rd8
        • 2.Qe6#
        • 2.Qc6#
        • 2.Qc7#
      • 1...Ra6
        • 2.Qxa6#
        • 2.Qxd7#
      • 1...Raa7
        • 2.Qc6#
      • 1...Rxc8!
    • 1.g8Q?
      • threat
        • 2.Qg3#
        • 2.Qg6#
      • 1...d1S+
        • 2.Qxd1#
      • 1...Rxf7
        • 2.Qg3#
      • 1...gxh1S
        • 2.Q1g6#
        • 2.Q8g6#
      • 1...f1S
        • 2.Qd4#
        • 2.Qg6#
      • 1...Ra4
        • 2.Qg6#
        • 2.c8S#
      • 1...Re8
        • 2.fxe8S#
      • 1...Re7!
  • Keys
    • 1.g8S!
      • threat
        • 2.Bg3#
      • 1...d1S+
        • 2.Qxd1#
      • 1...gxh1S
        • 2.Qg6#
      • 1...f1S
        • 2.Qd4#
      • 1...Re7
        • 2.Bxe7#
      • 1...Ra4
        • 2.c8S#
      • 1...Re8
        • 2.fxe8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 12
  • Sets
    • R(g);N_GUARD::P=S
    • R(g);N_GUARD,P_PINS(D)::P=S
    • R(g);OGATE::PXR(g)=S
    • P(a);OGATEB::QAR(A),XQ(a)
    • P(a);CHECK,OGATEB::QAR(A),XS(a)
    • P(a);OGATEB::QAR(A),XB(a)
    • P(a);OGATEB::QAR(A),XR(a)
    • P(b);OGATE::QAR2(A)
    • P(c);OGATE,XB(B)::QAR(A)
  • Tries
    • Try
      • P(I);
      • Threat
        • DUALS(2)
      • Vars
        • P(a);CHECK,OGATEB::QAR(A),XS(a)
        • R(f);::QAR1(I)
        • R(g);::QAR1(I)
      • Refutation
        • R(g);P_PINR(G),XQ(I)
    • Try
      • P(K);
      • Threat
        • DUALS(2)
      • Vars
        • P(a);CHECK,OGATEB::QAR(A),XS(a)
        • R(f);XP(J)::QAB(K)
        • R(g);OGATE::PXR(g)=S
      • Refutation
        • R(f);
  • Actual
    • P(K);
    • Threat
      • B(F)
    • Vars
      • P(a);CHECK,OGATEB::QAR(A),XS(a)
      • P(c);OGATE,XB(B)::QAR(A)
      • P(b);OGATE::QAR2(A)
      • R(f);N_GUARD::B(F),XR(f)
      • R(g);N_GUARD::P=S
      • R(g);OGATE::PXR(g)=S
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