MESON Chess Problem Database

Problem Display
PID: 201622 (k7/2K5/1P6/q1p1pp2/R7/Q5p1/r7/2n1b3 w - - 0 1)

Jakab, Arpad

Bekes, 1922

k7/2K5/1P6/q1p1pp2/R7/Q5p1/r7/2n1b3

#2

4 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Rxa6#
    • 1...Qa7+
      • 2.Rxa7#
      • 2.b7#
    • 1...Rd2
      • 2.Rxa5#
    • 1...Bf2
      • 2.Rxa5#
    • 1...c4
      • 2.Qf8#
  • Tries
    • 1.Rg4?
      • threat
        • 2.Rg8#
      • 1...Qa7+
        • 2.b7#
      • 1...Rd2
        • 2.Qxa5#
      • 1...fxg4!
    • 1.Rh4?
      • threat
        • 2.Rh8#
      • 1...Qa7+
        • 2.b7#
      • 1...Rd2
        • 2.Qxa5#
      • 1...Rh2!
    • 1.Qxc5?
      • threat
        • 2.Qf8#
        • 2.Qd5#
        • 2.Qc6#
      • 1...Qa7+
        • 2.b7#
      • 1...Qxa4
        • 2.b7#
      • 1...Rxa4
        • 2.Qf8#
        • 2.Qc6#
      • 1...Rd2
        • 2.Rxa5#
        • 2.Qxa5#
        • 2.Qc6#
      • 1...Bb4
        • 2.Qd5#
        • 2.Qc6#
      • 1...Rc2!
    • 1.Qd3?
      • threat
        • 2.Qd5#
        • 2.Qd8#
      • 1...Qa7+
        • 2.b7#
      • 1...Qxa4
        • 2.Qd8#
      • 1...Rd2
        • 2.Rxa5#
      • 1...Sxd3!
  • Keys
    • 1.Rd4!
      • threat
        • 2.Rd8#
      • 1...Qa7+
        • 2.b7#
      • 1...cxd4
        • 2.Qf8#
      • 1...exd4
        • 2.Qf3#
      • 1...Rd2
        • 2.Qxa5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(e);N_PINP(C),OGATE::R(B),XQ(e)
    • R(c);S_CUTB(b)::R(B),XQ(e)
    • B(b);N_GUARD::R(B),XQ(e)
    • P(f);OGATE::QAR(A)
  • Tries
    • Try
      • R(B);
      • Threat
        • R(B)
      • Vars
        • Q(e);CHECK,N_PINP(C)::P(C)
        • R(c);N_GUARD,S_CUTB(b)::QAR(A),XQ(e)
      • Refutation
        • P(h);XR(B)
    • Try
      • R(B);
      • Threat
        • R(B)
      • Vars
        • Q(e);CHECK,N_PINP(C)::P(C)
        • R(c);N_GUARD,S_CUTB(b)::QAR(A),XQ(e)
      • Refutation
        • R(c);
    • Try
      • Q(A);XP(f)
      • Threat
        • DUALS(3)
      • Vars
        • Q(e);CHECK,N_PINP(C)::P(C)
        • Q(e);N_PINP(C),N_SPINQ(e),XR(B)::P(C)
      • Refutation
        • R(c);P_PINQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);CHECK,N_PINP(C)::P(C)
        • Q(e);N_PINP(C),N_SPINQ(e),XR(B)::QAR(A)
        • R(c);N_GUARD,S_CUTB(b)::R(B),XQ(e)
      • Refutation
        • S(a);XQ(A)
  • Actual
    • R(B);
    • Threat
      • R(B)
    • Vars
      • Q(e);CHECK,N_PINP(C)::P(C)
      • P(f);OGATE,XR(B)::QAR(A)
      • P(g);N_GUARD,XR(B)::QAB(A)
      • R(c);N_GUARD,S_CUTB(b)::QAR(A),XQ(e)
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