MESON Chess Problem Database

Problem Display
PID: 246694 (4r1bB/3R3n/1p6/1p4Q1/1Pk5/1pPp4/6P1/2N3bK w - - 0 1)

Petite, Efren

El Ajedrez Espanol, 1958

4r1bB/3R3n/1p6/1p4Q1/1Pk5/1pPp4/6P1/2N3bK

#2

8 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.Rc7#
    • 1...Re6
      • 2.Qd5#
    • 1...Bd5
      • 2.Qxd5#
  • Tries
    • 1.Qf4+?
      • 1...Bd4
        • 2.Qxd4#
      • 1...Re4!
    • 1.Qh4+?
      • 1...Bd4
        • 2.Qxd4#
      • 1...Re4!
    • 1.Qg3?
      • threat
        • 2.Qxd3#
      • 1...Re3
        • 2.Qc7#
      • 1...d2
        • 2.Qd3#
      • 1...Be3!
    • 1.Qg4+?
      • 1...Bd4
        • 2.Qxd4#
      • 1...Re4!
    • 1.Qf5?
      • threat
        • 2.Qxd3#
      • 1...Re3
        • 2.Rc7#
      • 1...d2
        • 2.Qd3#
      • 1...Re4!
    • 1.Qg6?
      • threat
        • 2.Qxd3#
      • 1...Re3
        • 2.Qc6#
      • 1...d2
        • 2.Qd3#
      • 1...Re4!
    • 1.Qxg8+?
      • 1...Re6
        • 2.Qxe6#
      • 1...Rxg8!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Qxd3#
      • 1...Re3
        • 2.Rd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • R(h);S_CUTB(a)::R(G)
    • R(h);S_CUTB(i)::QAB1(F)
    • B(i);N_GUARD,P_PINP(C)::QAB1(F),XB(i)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR1(F),XB(a)
      • Refutation
        • R(h);P_SPINR(h)
    • Try
      • Q(F);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR1(F),XB(a)
      • Refutation
        • R(h);P_SPINR(h)
    • Try
      • Q(F);
      • Threat
        • QAB1(F),XP(c)
      • Vars
        • R(h);S_CUTB(a)::QAR(F)
        • P(c);::QAB1(F)
      • Refutation
        • B(a);
    • Try
      • Q(F);CHECK
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::QAR1(F),XB(a)
      • Refutation
        • R(h);P_SPINR(h)
    • Try
      • Q(F);
      • Threat
        • QAB1(F),XP(c)
      • Vars
        • R(h);S_CUTB(a)::R(G)
        • P(c);::QAB1(F)
      • Refutation
        • R(h);
    • Try
      • Q(F);
      • Threat
        • QAB1(F),XP(c)
      • Vars
        • R(h);S_CUTB(a)::QAR2(F)
        • P(c);::QAB1(F)
      • Refutation
        • R(h);
    • Try
      • Q(F);CHECK,XB(i)
      • Vars
        • R(h);N_GUARD,P_SPINR(h)::QAB(F),XR(h)
      • Refutation
        • R(h);XQ(F)
  • Actual
    • Q(F);
    • Threat
      • QAB1(F),XP(c)
    • Vars
      • R(h);S_CUTB(a)::R1(G)
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