MESON Chess Problem Database

Problem Display
PID: 834 (8/8/7K/7B/2p4B/2P1R3/1PPkP2R/N1b1n1Q1 w - - 0 1)

Durairaj, T

3rd Prize, British Chess Magazine Task Ty., 1969

8/8/7K/7B/2p4B/2P1R3/1PPkP2R/N1b1n1Q1

#2

11 + 4

56 The Problemist 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Kd1
      • 2.Qxe1#
    • 1...Sd3
      • 2.exd3#
    • 1...Sf3
      • 2.exf3#
  • Tries
    • 1.Bg5?
      • threat
        • 2.Rd3#
      • 1...Sd3
        • 2.Rxd3#
        • 2.exd3#
      • 1...Kd1!
    • 1.Rd3+?
      • 1...Sxd3
        • 2.exd3#
      • 1...cxd3!
    • 1.Re4?
      • threat
        • 2.Qxe1#
      • 1...Kd1+
        • 2.e3#
      • 1...Sg2
        • 2.Rd4#
        • 2.Qd4#
      • 1...Sd3
        • 2.exd3#
      • 1...Sf3
        • 2.exf3#
      • 1...Sxc2!
    • 1.Re5?
      • threat
        • 2.Qxe1#
      • 1...Kd1+
        • 2.e3#
      • 1...Sg2
        • 2.Rd5#
        • 2.Qd4#
      • 1...Sd3
        • 2.exd3#
      • 1...Sf3
        • 2.exf3#
      • 1...Sxc2!
    • 1.Re6?
      • threat
        • 2.Qxe1#
      • 1...Kd1+
        • 2.e3#
      • 1...Sg2
        • 2.Rd6#
        • 2.Qd4#
      • 1...Sd3
        • 2.exd3#
      • 1...Sf3
        • 2.exf3#
      • 1...Sxc2!
    • 1.Re7?
      • threat
        • 2.Qxe1#
      • 1...Kd1+
        • 2.e3#
      • 1...Sg2
        • 2.Rd7#
        • 2.Qd4#
      • 1...Sd3
        • 2.exd3#
      • 1...Sf3
        • 2.exf3#
      • 1...Sxc2!
    • 1.Re8?
      • threat
        • 2.Qxe1#
      • 1...Kd1+
        • 2.e3#
      • 1...Sg2
        • 2.Rd8#
        • 2.Qd4#
      • 1...Sd3
        • 2.exd3#
      • 1...Sf3
        • 2.exf3#
      • 1...Sxc2!
    • 1.Qg5?
      • threat
        • 2.Rd3#
      • 1...Sd3
        • 2.Rxd3#
        • 2.exd3#
      • 1...Kd1!
  • Keys
    • 1.Reh3!
      • threat
        • 2.Qxe1#
      • 1...Kd1+
        • 2.e3#
      • 1...Sxc2
        • 2.e4#
      • 1...Sg2
        • 2.Qd4#
      • 1...Sd3
        • 2.exd3#
      • 1...Sf3
        • 2.exf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(c);P-FLIGHT,P_PINR(H),P_SPINS(b)::QAR1(B),XS(b)
    • S(b);OGATE::R(F)+P(E),XS(b)
  • Tries
    • Try
      • B(I);
      • Threat
        • B(I)+R(H),DCHECK
      • Refutation
        • K(c);P-FLIGHT,P_SPINS(b)
    • Try
      • R(H);CHECK
      • Vars
        • S(b);OGATE,XR(H)::R(F)+P(E),XS(b)
      • Refutation
        • P(d);XR(H)
    • Try
      • R(H);
      • Threat
        • QAB1(B),XS(b)
      • Vars
        • K(c);CHECK,P-FLIGHT,P_SPINS(b)::B(J)+P(E)
        • S(b);OGATE::R(F)+P(E),XS(b)
      • Refutation
        • S(b);XP(D)
    • Try
      • R(H);
      • Threat
        • QAB1(B),XS(b)
      • Vars
        • K(c);CHECK,P-FLIGHT,P_SPINS(b)::B(J)+P(E)
        • S(b);OGATE::R(F)+P(E),XS(b)
      • Refutation
        • S(b);XP(D)
    • Try
      • R(H);
      • Threat
        • QAB1(B),XS(b)
      • Vars
        • K(c);CHECK,P-FLIGHT,P_SPINS(b)::B(J)+P(E)
        • S(b);OGATE::R(F)+P(E),XS(b)
      • Refutation
        • S(b);XP(D)
    • Try
      • R(H);
      • Threat
        • QAB1(B),XS(b)
      • Vars
        • K(c);CHECK,P-FLIGHT,P_SPINS(b)::B(J)+P(E)
        • S(b);OGATE::R(F)+P(E),XS(b)
      • Refutation
        • S(b);XP(D)
    • Try
      • R(H);
      • Threat
        • QAB1(B),XS(b)
      • Vars
        • K(c);CHECK,P-FLIGHT,P_SPINS(b)::B(J)+P(E)
        • S(b);OGATE::R(F)+P(E),XS(b)
      • Refutation
        • S(b);XP(D)
    • Try
      • Q(B);
      • Threat
        • QAB(B)+R(H),DCHECK
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • R(H);
    • Threat
      • QAB1(B),XS(b)
    • Vars
      • K(c);CHECK,P-FLIGHT,P_SPINS(b)::B(J)+P(E)
      • S(b);N_GUARD,XP(D)::R(F)+P(E)
      • S(b);N_GUARD::QAR2(B)
      • S(b);OGATE::R(F)+P(E),XS(b)
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