MESON Chess Problem Database

Problem Display
PID: 12299 (2K3b1/2PB2r1/2N5/3p4/kP6/N1r3R1/2P5/R2Q4 w - - 0 1)

Lender, Baruch

3rd HM., Provence-Magazine, 1977-1978

2K3b1/2PB2r1/2N5/3p4/kP6/N1r3R1/2P5/R2Q4

#2

10 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc2
      • 2.Qxc2#
    • 1...Rxa3
      • 2.c4#
    • 1...Rb3
      • 2.cxb3#
    • 1...Rd3
      • 2.cxd3#
    • 1...Re3
      • 2.c3#
    • 1...Rf3
      • 2.c3#
    • 1...Rcxg3
      • 2.c3#
    • 1...Rc4
      • 2.c3#
    • 1...Rc5
      • 2.c3#
      • 2.c4#
    • 1...Rxc6
      • 2.c3#
  • Tries
    • 1.Sb1+?
      • 1...Ra3
        • 2.Sc3#
        • 2.c4#
      • 1...Kb5!
    • 1.Sb5+?
      • 1...Ra3
        • 2.Sc3#
        • 2.c4#
      • 1...Kxb5!
    • 1.Se7+?
      • 1...Rc6
        • 2.c3#
      • 1...Kxb4!
    • 1.Qd3?
      • threat
        • 2.Qb5#
        • 2.Qa6#
      • 1...Rxa3
        • 2.Rxa3#
        • 2.Qa6#
      • 1...Rxc6
        • 2.Qb5#
        • 2.Qb3#
      • 1...Rc4
        • 2.Qb3#
      • 1...Rc5
        • 2.Sb1#
        • 2.Sb5#
        • 2.Qb3#
      • 1...Rxd3!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Qa7#
      • 1...Rxa3
        • 2.Se7#
      • 1...Rxc6
        • 2.Bxc6#
      • 1...Rc5
        • 2.bxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • R(a);OGATE,P_SPINR(a),XP(C)::QAB(B),XR(a)
    • R(a);OGATE,P_SPINR(a),XS(D)::QAB(B)+P(C)
    • R(a);OGATE::P(C),XR(a)
    • R(a);OGATE::QAB(B)+P(C),XR(a)
    • R(a);OGATE::QAB(B)+P(C)
    • R(a);OGATE,XR(E)::QAB(B)+P(C)
    • R(a);OGATE,P_PINP(H),P_SPINR(a),XS(G)::QAB(B)+P(C)
  • Tries
    • Try
      • S(D);CHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(D);CHECK
      • Refutation
        • K(b);S_FLIGHT,XS(D)
    • Try
      • S(G);CHECK,P_SPINP(H)
      • Vars
        • R(a);OGATE,P_SPINR(a)::QAB(B)+P(C)
      • Refutation
        • K(b);P-FLIGHT,XP(F)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);OGATE::QAB1(B)
      • Refutation
        • R(a);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • R(a);N_GUARD,P_SPINR(a),XS(D)::B(I)+S(G)
      • R(a);OGATE,P_PINP(H),P_SPINR(a),XS(G)::B(I),XR(a)
      • R(a);OGATE::QAR(B)+P(F),XR(a)
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