MESON Chess Problem Database

Problem Display
PID: 173596 (k1K5/q7/8/2p5/Q1R5/8/8/8 w - - 0 1)

Boros, Sandor

Magyar Sakkvilag, 1926

k1K5/q7/8/2p5/Q1R5/8/8/8

#2

3 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa4
      • 2.Rxa4#
    • 1...Qa5
      • 2.Qxa5#
    • 1...Qa6+
      • 2.Qxa6#
  • Tries
    • 1.Rb4?
      • threat
        • 2.Rb8#
      • 1...Qa6+
        • 2.Qxa6#
      • 1...Qxa4
        • 2.Rxa4#
      • 1...Qa5
        • 2.Qxa5#
      • 1...cxb4!
    • 1.Re4?
      • 1...Qa6+
        • 2.Qxa6#
      • 1...Qxa4
        • 2.Rxa4#
      • 1...Qa5
        • 2.Qxa5#
      • 1...c4!
    • 1.Rf4?
      • 1...Qa6+
        • 2.Qxa6#
      • 1...Qxa4
        • 2.Rxa4#
      • 1...Qa5
        • 2.Qxa5#
      • 1...c4!
    • 1.Rg4?
      • 1...Qa6+
        • 2.Qxa6#
      • 1...Qxa4
        • 2.Rxa4#
      • 1...Qa5
        • 2.Qxa5#
      • 1...c4!
    • 1.Rh4?
      • 1...Qa6+
        • 2.Qxa6#
      • 1...Qxa4
        • 2.Rxa4#
      • 1...Qa5
        • 2.Qxa5#
      • 1...c4!
    • 1.Rxc5?
      • 1...Qa6+
        • 2.Qxa6#
      • 1...Qa5
        • 2.Rxa5#
        • 2.Qxa5#
      • 1...Qxa4!
    • 1.Qa1?
      • 1...Qa6+
        • 2.Qxa6#
      • 1...Qa2
        • 2.Qxa2#
      • 1...Qa3
        • 2.Qxa3#
      • 1...Qa4
        • 2.Rxa4#
        • 2.Qxa4#
      • 1...Qa5
        • 2.Qxa5#
      • 1...Qxa1!
    • 1.Qa2?
      • 1...Qa6+
        • 2.Qxa6#
      • 1...Qa3
        • 2.Qxa3#
      • 1...Qa4
        • 2.Rxa4#
        • 2.Qxa4#
      • 1...Qa5
        • 2.Qxa5#
      • 1...Qxa2!
    • 1.Qa3?
      • 1...Qa6+
        • 2.Qxa6#
      • 1...Qa4
        • 2.Rxa4#
        • 2.Qxa4#
      • 1...Qa5
        • 2.Qxa5#
      • 1...Qxa3!
    • 1.Qa5?
      • 1...Qa6+
        • 2.Qxa6#
      • 1...Qxa5!
  • Keys
    • 1.Qc6+!
      • 1...Qb7+
        • 2.Qxb7#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • Q(b);N_SPINQ(b),OGATE,XQ(A)::R(B),XQ(b)
    • Q(b);OGATEB::QAR(A),XQ(b)
    • Q(b);CHECK,OGATEB::QAR2(A),XQ(b)
  • Tries
    • Try
      • R(B);
      • Threat
        • R1(B)
      • Vars
        • Q(b);CHECK,OGATEB::QAR2(A),XQ(b)
        • Q(b);N_SPINQ(b),OGATE,XQ(A)::R(B),XQ(b)
        • Q(b);OGATEB::QAR(A),XQ(b)
      • Refutation
        • P(a);XR(B)
    • Try
      • R(B);
      • Vars
        • Q(b);CHECK,OGATEB::QAR2(A),XQ(b)
        • Q(b);N_SPINQ(b),OGATE,XQ(A)::R(B),XQ(b)
        • Q(b);OGATEB::QAR(A),XQ(b)
      • Refutation
        • P(a);
    • Try
      • R(B);
      • Vars
        • Q(b);CHECK,OGATEB::QAR2(A),XQ(b)
        • Q(b);N_SPINQ(b),OGATE,XQ(A)::R(B),XQ(b)
        • Q(b);OGATEB::QAR(A),XQ(b)
      • Refutation
        • P(a);
    • Try
      • R(B);
      • Vars
        • Q(b);CHECK,OGATEB::QAR2(A),XQ(b)
        • Q(b);N_SPINQ(b),OGATE,XQ(A)::R(B),XQ(b)
        • Q(b);OGATEB::QAR(A),XQ(b)
      • Refutation
        • P(a);
    • Try
      • R(B);
      • Vars
        • Q(b);CHECK,OGATEB::QAR2(A),XQ(b)
        • Q(b);N_SPINQ(b),OGATE,XQ(A)::R(B),XQ(b)
        • Q(b);OGATEB::QAR(A),XQ(b)
      • Refutation
        • P(a);
    • Try
      • R(B);XP(a)
      • Vars
        • Q(b);CHECK,OGATEB::QAR2(A),XQ(b)
      • Refutation
        • Q(b);N_SPINQ(b),XQ(A)
    • Try
      • Q(A);
      • Vars
        • Q(b);CHECK,OGATEB::QAR2(A),XQ(b)
        • Q(b);OGATEB::QAR(A),XQ(b)
      • Refutation
        • Q(b);N_SPINQ(b),XQ(A)
    • Try
      • Q(A);
      • Vars
        • Q(b);CHECK,OGATEB::QAR2(A),XQ(b)
        • Q(b);OGATEB::QAR(A),XQ(b)
      • Refutation
        • Q(b);N_SPINQ(b),XQ(A)
    • Try
      • Q(A);
      • Vars
        • Q(b);CHECK,OGATEB::QAR2(A),XQ(b)
        • Q(b);OGATEB::QAR(A),XQ(b)
      • Refutation
        • Q(b);N_SPINQ(b),XQ(A)
    • Try
      • Q(A);
      • Vars
        • Q(b);CHECK,OGATEB::QAR2(A),XQ(b)
      • Refutation
        • Q(b);N_SPINQ(b),XQ(A)
  • Actual
    • Q(A);CHECK,N_PINQ(b)
    • Vars
      • Q(b);CHECK,N_GUARD,P_SPINQ(b)::QAB1(A),XQ(b)
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Developed and maintained by Brian Stephenson.
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