MESON Chess Problem Database

Problem Display
PID: 183073 (8/8/8/8/1R1Q4/p1p5/1P6/k1K5 w - - 0 1)

Grassano, Carlos A

Kudesnik, 2017

8/8/8/8/1R1Q4/p1p5/1P6/k1K5

#2

4 + 3

SOLUTION

  • SOUND
  • Tries
    • 1.Ra4?
      • threat
        • 2.Rxa3#
      • 1...cxb2+
        • 2.Qxb2#
      • 1...Ka2
        • 2.Rxa3#
      • 1...a2!
    • 1.bxc3?
      • 1...a2
        • 2.c4#
      • 1...Ka2!
    • 1.b3?
      • 1...a2
        • 2.Qxc3#
      • 1...Ka2!
  • Keys
    • 1.Qxc3!
      • threat
        • 2.Qxa3#
      • 1...axb2+
        • 2.Qxb2#
      • 1...Ka2
        • 2.Qxa3#
      • 1...a2
        • 2.b3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(C);P_PINP(b)
      • Threat
        • R(C),XP(b)
      • Vars
        • P(c);CHECK,N_SPINP(b),OGATE,P_SPINP(c),XP(B)::QAB1(D),XP(c)
        • K(a);P-FLIGHT::R1(C),XP(b)
      • Refutation
        • P(b);
    • Try
      • P(B);XP(c)
      • Vars
        • P(b);SBLOCK::QAB(D)+P(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(B);P_PINP(c)
      • Vars
        • P(b);SBLOCK::QAB(D),XP(c)
      • Refutation
        • K(a);N_SPINP(c),P-FLIGHT
  • Actual
    • Q(D);XP(c)
    • Threat
      • QAR2(D),XP(b)
    • Vars
      • P(b);CHECK,OGATE,P_SPINP(b),XP(B)::QAB1(D),XP(b)
      • K(a);P-FLIGHT::QAR1(D),XP(b)
      • P(b);SBLOCK::QAB(D)+P(B)
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